Chair-iron.



No. 821,034. PATENTED MAY 22, 1906. J. E. GILSON.

CHAIR IRON.

APPLICATION FILED AUG. 3, 1905.

UNITED STATES PATENT OFFICE.

JOHN E. GILSON, OF PORT WASHINGTON, WISCONSIN, ASSIGNOR TO GILSON MANUFACTURING COMPANY, OF PORT WASHINGTON, WISCONSIN, A CORPORATION OF ILLINOIS.

CHAIR-IRON.

Specification of Letters Patent.

Patented May 22, 1906.

Application filed August 8, 1905. Serial No. 272,579.

To all whom, it WY/CLZ/ concern:

Be it known that I, JOHN E. Carson, a citizen of the United States, residing at Port Washington, in the county of Ozaukee and State of Wisconsin, have invented certain Improvements in ChairIrons, of which the following is a specification.

This invention relates to improvements in chair-irons, especially those employed in non-tilting rotatable chairsas, for instance, stools.

The objects of the invention are to pro duce a simple, inexpensive, strong, and durable chair-iron of this kind in which is embodied the well-known, commonly-employed, and highly-appreciated semitubular sheetmetal spiderarms.

IVith these and other objects in view the invention may be said to consist in a central support or hub of cast metal adapted to be supported upon a spindle and provided with a plurality of radiating or othcrwise-disposed spider-arm seats, in semitubular spider-arms arranged in the seats, and in means for securing such arms rigidly therein.

Referring to the drawings, Figure 1 is a plan view of a chair-iron of the style mentioned and embodying my invention, two of the spider-arms being shown broken away. Fig. 2 is a longitudinal section on the line 00 9c of Fig. 1. Fig. 3 is a transverse section on line y y of Fig. 1.

Similar numerals of reference indicate similar parts in all the figures of the drawings.

The central hub or support 1 is formed of cast-iron and with a plurality of branches 2, which in this instance are three in number, radiate from points near the center of the hub, and therefore give to the hub a somewhat triangular appearance. The hub, it will be understood, is preferably triangular, but may be varied from this shape. However, in this instance there is formed in each of the radial branches 2 and in the upper side thereof depressions which constitute spider-arm seats 3, which are of a shape in cross-section adapting them to receive each the inner end of a semitubular sheet-metal spider-arm 4. The spider-arms are in this instance somewhat semitubular or U-shaped in crosssection, and hence are the seats; but of course the arms and seats may be given any other mutual shape in cross-section that may be desired. The outer ends of the arms are adapted for attachment to the under side of the bottom or seat of the stool and for this purpose may be flared and perforated, as indicated at 5.

Various means may be employed and will readily suggest themselves for securing the spider-arms within the seats; but I prefer for this purpose to provide the end wall of each seat with a short radial intermediate lug 6, which lug terminates at its bottom a slight distance above the seat 3, whereby there is formed between the lug and said seat an intermediate recess or slot 7, of a thickness about agreeing with the thickness of metal of which the spider-arms are formed. In mounting the spider-arms in position the inner ends of the same are forced into the slot 7, and the lugs 6, being of malleable iron, may or may not be turned downward, so as to clamp the spiderarms. In addition, I prefer to emplo'y some other means of fastening, preferably rivets 8, one for each arm and seat and passing through the arm and seat at the center of the same and immediately in advance of the lug 6. For this purpose the arm and seat are provided with holes 9 and 10, respectively.

It will thus be apparent that I have combined a heavy central casting or support with the light strong sheet-metal spiderarms, securing the same in such rigid manner as renders the entire structure strong and yet at the same time comparatively light.

Having thus described my invention, what I claim is- 1. The combination with a cast-metal hub or support provided with radial spider-arm seats, having inner abutting walls of spider arms formed of sheet metal mounted on the seats, and at their rear ends abutting against the walls and rivets passed through the arms and seats.

2. The combination with a cast-metal hub or support having depressed radial seats provided with inner abutting walls, of spiderarms of sheet metal conforming in cross-section to the seats, and abutting against said walls and means for securing the arms in the seats.

3. The combination with a cast-metal hub or support having a plurality of outwardlydisposed depressed seats, of sheet-metal spider-arms mounted in and conforming to the seats, and engaged at their rear ends by the rear walls of the seats and means for securing the arms within the seats.

' 4. The combination,with a cast-metal hub or support having outwardly-disposed depressed seats terminating short of the center of the hub, of sheet-metal spider-arms semitubular in cross-section and mounted in and conforming to the seats, engaged by a wall thereof.

5. The combination with a cast-metal hub or support having a depressed seat and an intermediate lug terminating above the seat and combining therewith to form a slot, of a semitubular sheet-metal spider-arm mounted in the seat and having its rear end extended under the lug and within the slot.

6. The combination with a cast-metal hub having a depressed seat and a radial lug extending from its back wall and terminating above the seat, of a spider-arm semitubular in cross-section, formed of sheet metal, and inounted in the seat and extended under the 7. The combination with a cast-metal hub having a depressed seat and provided with a securing-lug extending from the wall thereof, of a sheet-metal semitubular spider-arm arran ed in the seat and clamped by means of the ug.

8. The combination with a cast-metal hub having a depressed seat the wall of which is a sheet-metal spider-arm arranged in the seat and extending into the slot, and a rivet passed through the spider-arm and bottom of 'short of the center of the hub and semitubular sheet-metal spider-arms arranged in and conforming to the seat, and engaged by the rear walls thereof.

-10; The combination with the cast-metal hub having the radial branches provided with concaved seatsnear their outer ends and having their inner walls each provided with a lug 6 combining with the bottom of the seat to form the recess 7, the sheet-metal semitubular spider-arms 41: mounted in the seats and extending into the slots, and the rivets 8 passing through the seats and the arms.

1 1. The combination with ahub or support having a depressed seat provided with an intermediate lug spaced therefrom and combining therewith to form a slot, of a spiderarm mounted in the seat and extending under the lug and within the seat.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

' JOHN E. GILSON.

Witnesses:

AUG. BOERGER, T. A. BOERNER. 

